03.25.12 8:45 AM ET

January Jones’ Bra Trick

A former model who turned to acting, Jones says she didn’t want to over prepare for her role as Betty Draper—she only read The Feminine Mystique and Revolutionary Road. In the video below, Jones talks about her first job playing Gwyneth Paltrow in a TV commercial, what she thinks of the Betty Barbie and how the series’ undergarments help prop up her character.

John Slattery: I Was Naked!

For his debut as an actor, John Slattery (who plays Roger Sterling) didn’t need a wardrobe department, because he appeared without any clothes on stage. For those of us unfortunate enough to miss it, he recalls that experience, as well as answers a very important question: do casting directors ever ask him to dye his white hair?

Jon Hamm on Groupies

Does Don Draper appeal more to men or to women? Hamm offers his theory on how both relate to Draper and explains why the show’s fans are drawn to him for different reasons.

Vincent Kartheiser’s Bathroom Interview

This is the first time we’ve ever followed an actor into the toilet. But Kartheiser, who plays the advertising peon Pete Campbell, gamely agreed to do his interview with us in front of a mirror, where he explained why he’d never rehearse his lines in such a place.

How Matthew Weiner Sold Mad Men

The creator of the AMC series talks about the “wish fulfillment” aspect of the show, and why its historic time period still resonates with viewers today.

Kiernan Shipka: ‘I’m Not a Viewer’

She landed the role of Don’s oldest daughter Sally when she was 6. Now that she’s 12, Shipka says she still doesn’t watch the show—but she’s allowed to attend table readings.

Jared Harris: ‘F—k This.’

When he went to audition for the role of Lane Pryce, the lot security wouldn’t let him inside. Then the British actor completely botched his lines, because he misunderstood the character. Harris recounts that day in the video below.